Java tutorial
/******************************************************************************* * Copyright (c) 2000, 2010 IBM Corporation and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * IBM Corporation - initial API and implementation *******************************************************************************/ package ext.org.eclipse.jdt.internal.ui.actions; import org.eclipse.swt.widgets.Shell; import org.eclipse.core.runtime.CoreException; import org.eclipse.core.resources.IFolder; import org.eclipse.core.resources.IProject; import org.eclipse.core.resources.IProjectNature; import org.eclipse.core.resources.IResource; import org.eclipse.jface.dialogs.IDialogConstants; import org.eclipse.jface.dialogs.MessageDialog; import org.eclipse.jface.dialogs.MessageDialogWithToggle; import org.eclipse.jface.preference.IPreferenceStore; import org.eclipse.ui.texteditor.AbstractDecoratedTextEditorPreferenceConstants; import org.eclipse.ui.editors.text.EditorsUI; import org.eclipse.jdt.core.IJavaElement; import org.eclipse.jdt.core.IJavaProject; import org.eclipse.jdt.core.IPackageFragment; import org.eclipse.jdt.core.IPackageFragmentRoot; import org.eclipse.jdt.core.JavaCore; import ext.org.eclipse.jdt.internal.corext.refactoring.util.ResourceUtil; import ext.org.eclipse.jdt.internal.corext.util.Messages; import ext.org.eclipse.jdt.internal.ui.javaeditor.JavaEditor; import ext.org.eclipse.jdt.internal.ui.viewsupport.BasicElementLabels; /* * http://dev.eclipse.org/bugs/show_bug.cgi?id=19104 */ public class ActionUtil { private ActionUtil() { } //bug 31998 we will have to disable renaming of linked packages (and cus) public static boolean mustDisableJavaModelAction(Shell shell, Object element) { if (!(element instanceof IPackageFragment) && !(element instanceof IPackageFragmentRoot)) return false; IResource resource = ResourceUtil.getResource(element); if ((resource == null) || (!(resource instanceof IFolder)) || (!resource.isLinked())) return false; MessageDialog.openInformation(shell, ActionMessages.ActionUtil_not_possible, ActionMessages.ActionUtil_no_linked); return true; } public static boolean isProcessable(JavaEditor editor) { if (editor == null) return true; Shell shell = editor.getSite().getShell(); IJavaElement input = SelectionConverter.getInput(editor); // if a Java editor doesn't have an input of type Java element // then it is for sure not on the build path if (input == null) { MessageDialog.openInformation(shell, ActionMessages.ActionUtil_notOnBuildPath_title, ActionMessages.ActionUtil_notOnBuildPath_message); return false; } return isProcessable(shell, input); } public static boolean isProcessable(Shell shell, IJavaElement element) { if (element == null) return true; if (isOnBuildPath(element)) return true; MessageDialog.openInformation(shell, ActionMessages.ActionUtil_notOnBuildPath_title, ActionMessages.ActionUtil_notOnBuildPath_message); return false; } public static boolean isOnBuildPath(IJavaElement element) { //fix for bug http://dev.eclipse.org/bugs/show_bug.cgi?id=20051 if (element.getElementType() == IJavaElement.JAVA_PROJECT) return true; IJavaProject project = element.getJavaProject(); try { if (!project.isOnClasspath(element)) return false; IProject resourceProject = project.getProject(); if (resourceProject == null) return false; IProjectNature nature = resourceProject.getNature(JavaCore.NATURE_ID); // We have a Java project if (nature != null) return true; } catch (CoreException e) { } return false; } public static boolean areProcessable(Shell shell, IJavaElement[] elements) { for (int i = 0; i < elements.length; i++) { if (!isOnBuildPath(elements[i])) { MessageDialog.openInformation(shell, ActionMessages.ActionUtil_notOnBuildPath_title, Messages.format(ActionMessages.ActionUtil_notOnBuildPath_resource_message, new Object[] { BasicElementLabels.getPathLabel(elements[i].getPath(), false) })); return false; } } return true; } /** * Check whether <code>editor</code> and <code>element</code> are * processable and editable. If the editor edits the element, the validation * is only performed once. If necessary, ask the user whether the file(s) * should be edited. * * @param editor an editor, or <code>null</code> iff the action was not * executed from an editor * @param shell a shell to serve as parent for a dialog * @param element the element to check, cannot be <code>null</code> * @return <code>true</code> if the element can be edited, * <code>false</code> otherwise */ public static boolean isEditable(JavaEditor editor, Shell shell, IJavaElement element) { if (editor != null) { IJavaElement input = SelectionConverter.getInput(editor); if (input != null && input.equals(element.getAncestor(IJavaElement.COMPILATION_UNIT))) return isEditable(editor); else return isEditable(editor) && isEditable(shell, element); } return isEditable(shell, element); } public static boolean isEditable(JavaEditor editor) { if (!isProcessable(editor)) return false; return editor.validateEditorInputState(); } public static boolean isEditable(Shell shell, IJavaElement element) { if (!isProcessable(shell, element)) return false; IJavaElement cu = element.getAncestor(IJavaElement.COMPILATION_UNIT); if (cu != null) { IResource resource = cu.getResource(); if (resource != null && resource.isDerived(IResource.CHECK_ANCESTORS)) { // see org.eclipse.ui.texteditor.AbstractDecoratedTextEditor#validateEditorInputState() final String warnKey = AbstractDecoratedTextEditorPreferenceConstants.EDITOR_WARN_IF_INPUT_DERIVED; IPreferenceStore store = EditorsUI.getPreferenceStore(); if (!store.getBoolean(warnKey)) return true; MessageDialogWithToggle toggleDialog = MessageDialogWithToggle.openYesNoQuestion(shell, ActionMessages.ActionUtil_warning_derived_title, Messages.format(ActionMessages.ActionUtil_warning_derived_message, BasicElementLabels.getPathLabel(resource.getFullPath(), false)), ActionMessages.ActionUtil_warning_derived_dontShowAgain, false, null, null); EditorsUI.getPreferenceStore().setValue(warnKey, !toggleDialog.getToggleState()); return toggleDialog.getReturnCode() == IDialogConstants.YES_ID; } } return true; } }